IPhone 8 & JVC KW-V950BW wireless CarPlay radio

Update July 9,2021: Problem was solved! JVC had me double-check the external microphone, instructing me to remove it from the vehicle and connect it to a phone or PC. Upon removal, I discovered that the cord had somehow been sheared, an absolute clean cut, somewhere under the dash. I would have not have suspected the microphone to be the problem since it worked for about 2 months after installing then stopped working, so I ruled it out as a possibility. It is strange though, when I disconnected the cord for the microphone, the built-in internal microphone was not picking up my voice when speaking either, even after initializing the stereo as JVC instructed. I purchased a new microphone, plugged it in, and Siri picked up everything I spoke when sending a message. Thank you all for putting ideas out there for me to help solve this problem.

I have verified that it does not work even when using a lightning cable. I erased the phone from the decks’ memory and cleared it from my phone, then disabled WiFi and Bluetooth. I connected the phone via lightning cable to the USB port designated for iPhone use for the deck. CarPlay initiated immediately and I attempted to send a message by use of the stereo. Siri asked what I want to say, chimed, I spoke, but Siri did not pick it up. I also reset my network setting via the General settings menu, which did not fix the issue. My next step is to try another phone. I will attempt to contact JVC as my last step, as I want to try to eliminate everything for iPhone and CarPlay.

I have tested the unit using an older iPhone running iOS 8, but the phone was not supported. I was hoping to see if the older operating system had any success, as my phone running iOS 11 worked fine before the iOS 12 update. I also tried an iPhone 7plus with the latest iOS update with no success.

I will contact JVC as my next step and see if they may have a solution. I will keep this thread alive, as a quick google search shows others are are having issues with other manufacturers of radios as well after the iOS 12 update. Just as additional info, I re-flashed the maestro RR module that enables the vehicle to fully integrate into the deck, but this time disabled the factory Ford Microsoft SYNC system. My thought was perhaps a Bluetooth connection was being made with SYNC and not allowing CarPlay to hear me, but it had no effect.

Update July 3, 2021: I contacted JVC Support and they suggested the following:

I understand you are inquiring about the KW-V950BW. I recommend that you test the Bluetooth feature on the unit without connecting to CarPlay via USB. Simply connect to the unit via Bluetooth and make a test call. If the issue continues, pair and test a different phone via Bluetooth to rule out a compatibility issue. 

I cleared the stereo from my iPhone and cleared my phone from the stereo. I connected the phone as directed, Bluetooth only. When making a test call, I had the same situation; I could hear the other caller, but they could not hear me.

I will try to test using another iPhone and an android phone and report back.

July 5, 2021: I have tried some troubleshooting steps that were recommended by JVC, but still had the same outcome. The steps included trying to connect my iPhone vis Bluetooth only, no Carplay, but had no success. I then tried using my friend’s Android phone via Bluetooth only and Android Auto, but still had the same problem. I reported my findings back to JVC and hopefully will hear back from them soon.